Sequential structured volumetric ultrasound holography for self-positioning using monaural recording

Area of Science:

• Acoustics
• Signal Processing
• Metrology

Background:

• Accurate microphone positioning is crucial for various applications.
• Existing microphone-array methods often require synchronized recordings and phase information.
• Amplitude-to-voltage calibration can be a limiting factor in positioning systems.

Purpose of the Study:

• To propose a structured acoustic holography technique for single microphone self-positioning.
• To enable accurate localization without relying on phase information or amplitude calibration.
• To develop a robust positioning system for a defined workspace.

Main Methods:

• Sequential projection of 3D ultrasonic holograms within a workspace.
• Recording monaural signals with a single microphone.
• Determining microphone position via cross-correlation peak detection between received and reference signals.

Main Results:

• Numerical experiments showed measurement errors less than 1 mm within a 100×100×50 mm³ workspace.
• Real-environment experiments maintained sub-millimeter accuracy for over 96% of observation points.
• The method demonstrated independence from phase information and amplitude calibration.

Conclusions:

• The proposed acoustic holography technique offers a simplified and accurate self-positioning solution for single microphones.
• It overcomes limitations of existing methods by eliminating the need for synchronized recordings and complex calibration.
• This approach is suitable for applications requiring precise microphone localization in defined spaces.